Давно не скачивает через кнопку в Ютубе. Скачивал последнее время через ss - сегодня перестало работать и это.

Sadly does not support properly facebook anymore. Videos like relations, rolls etc can not be downloaded because the add-on icon does not shows up on those media like it did previously.
Additionally the user-script variant of the add-on notoriously popups very irritating ads on the pages about some "OrangeMonkey" add-on. Those can't be disabled or turned off.
Sorry folks, but I won't use such OrangeMonkey junk just because you want me to use it.
Just f-off with that crap please!
Such nasty behavior should be also reported to Mozilla due to the violation of their rules!

From the pop up page after clicking on the icon:

Subject: Discontinuation of Service in the United States

April 16, 2020

Dear Savefrom User:

As you may have heard, our industry has been under strenuous attacks by certain US copyright holders. Because of these attacks, it has become financially impractical for Savefrom to continue to provide services in the United States.

Accordingly, Savefrom will be terminating its services in the United States as of April 28, 2020.

We thank you for your past loyalty and patronage and wish you health and safety during the present health crisis and beyond.

Very truly yours,

Savefrom

It doesn't work, can't download anything, creates incorrect links.

does nothing

Error:
Invalid data found when processing input

Broken again

Don`t work at all.

Когда-то был отличный плагин, а сейчас "полный отстой" (версия 10.20)
Плагин абсолютно "кривой".
Не появляется ссылка для скачивания на сайтах:
- VK
- Odnoklassniki
- YouTube и так далее...
(Firefox версия 115.6)

Non funziona!

Не качает уж месяц как.

In fact, the application does not download from YouTube.Only the link to the site works.We need to correct the description.

720p maximum, or you can download 4K without audio, and audio in a separate file.

Why can't the extension put video and audio together?!

Seems like a lazy developer to me.